Premanand Maharaj Ji
Why must children's mobile use be kept under strict control?
Use the phone only as needed
The mobile is a big fault because on it you can see everything, and a restless mind is drawn to it again and again. So use it only as much as is truly needed and take its good side.
So first of all, use the mobile only as much as is absolutely necessary. There is good in it too: you can listen to satsang and pass on essential information.